The hypersonic soundwave manipulator was a genetic manipulator invented by ProfessorRichard Lazarus. The machine would turn anyone inside decades younger, but the process contained one side effect: genes that evolution rejected and left dormant would be unlocked, transforming the human into a giant skeletal scorpion-like beast that fed off the lifeforce of living creatures. The Doctor later used it to try to kill Lazarus, but he was just knocked out and reverted to human form. (TV: The Lazarus Experiment)

"[using] hypersonic sound waves to destabilise the cell structure, then a metagenic programme to manipulate the coding in the protein strands. Basically, he hacked into his own genes and instructed them to rejuvenate."